Spectroscopically Identified Cataclysmic Variables from the LAMOST Survey. II. Period Estimates
Spectroscopically Identified Cataclysmic Variables from the LAMOST Survey. II. Period Estimates
复制标题
DOI：
10.3847/1538-3881/aca906
复制
发表时间：
2023-03
期刊：
影响因子：
--
通讯作者：
W. Hou;A. Luo;Yiqiao Dong;Xiang-Lei Chen;Z. Bai
中科院分区：
文献类型：
--
作者：
W. Hou;A. Luo;Yiqiao Dong;Xiang-Lei Chen;Z. Bai
我们研究了一个样本的340个激变变量（CV）的最新数据发布的大天区多目标光纤光谱望远镜（LAMOST）的调查，沿着18个对象，新分类为CV。在本文中，我们专注于调查的光度行为，这些CV使用的数据从时域调查。三个新的和五个以前已知的对象的轨道周期确定的长期光变曲线显示日食或椭球变化，和/或时间分辨光谱LAMOST。对于另外16个具有实测周期的CV，使用来自不同调查的光变曲线获得一致的周期更可靠，因为从单站点数据获得的周期仍然是值得怀疑的。需要进行后续观察，以确认这些周期是否具有物理意义或与轨道相关。在我们的样本中，我们发现大多数物体的周期都超过了2 × 3小时。除了周期估计外，我们还对一些有价值的CV进行了单独的详细分析，包括光谱特征和亚型确定。最后，我们讨论了这个样本的观测性质，包括轨道周期的分布，绝对星等，和每个子类的CV的统计特性。此外，我们挑选出六个非CV系统，包括五个照明效应双星，以及一个热亚矮星，我们在搜索CV时遇到的，我们调查他们的光谱和光度数据的基础上的属性。
We examine a sample of 340 cataclysmic variables (CVs) from the latest data release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey, along with 18 objects that are newly classified as CVs. In this paper, we focus on investigating the photometric behaviors of these CVs using data from time-domain surveys. The orbital periods of three new and five previously known objects are determined from the long-term light curves displaying eclipses or ellipsoidal variations, and/or time-resolved spectra from LAMOST. For another 16 CVs with measured periods, it is more reliable to obtain consistent periods using light curves from different surveys, as the periods derived from single-site data are still questionable. Follow-up observations are needed to confirm whether the periods have physical meanings or are orbital-related. In our sample, we find that most of the objects have longer periods above the 2 ∼ 3 hr gap. Besides period estimates, we also carry out a separate detailed analysis of some valuable CVs, in terms of spectral characteristics and subtype determination. Finally, we discuss the observational properties of this sample, including the distributions of orbital periods, absolute magnitudes, and the statistical properties of each subclass of CVs. In addition, we pick out six non-CV systems, including five illumination-effect binaries, as well as one hot subdwarf, that we came across when searching for CVs, and we investigate their properties based on the spectra and photometric data.